Luminescent Cu(I) coordination polymers from triphenylamine based S-donor ligands

Abstract

The aim of this project is to synthesize and characterize triphenylamine based S-donor ligands, their Cu(I) coordination polymers and explore the applications of the synthesized complexes. Cu(I) coordination polymers are known to emit light in the UV-visible range upon excitation and this makes them usable as emitters in the optoelectronic devices or they can be used in many other fields like sensing, separation, adsorption and photocatalysis. For this work, efforts were made to the synthesis of triphenylamine based S donor ligands for Cu(I) Coordination Polymers. For which, I have made four ligands. These four ligands are N-(4-(1,3-dithiolan-2-yl)phenyl)-4-(1,3- dithiolan-2-yl)-N-phenylaniline (1), N-(4-(1,3-dithian-2-yl)phenyl)-4-(1,3- dithian-2-yl)-N-phenylaniline (2), tris-(4-(1,3-dithiolan-2-yl)phenyl)amine (3), tris-(4-(1,3-dithian-2-yl)phenylamine (4). Different coordination polymers with Cu2X2 rhomboids were obtained from the reaction of ligand 1 and 2 with Cu(I) halides. In case of ligand 2 & CuI, a 3D coordination polymer was obtained while in other cases, formation of 1D CPs were observed. These CPs are insoluble in most of the organic solvents. All the coordination polymers were found to be luminescent and show emission in 450-500 nm range. In addition, some of the CPs show solvatochromism while some show mechanochromic behaviour. All the synthesized ligands were characterized by the Mass Spectrometry, 1 H NMR Spectroscopy & 13C NMR Spectroscopy. All the coordination polymers are characterized by the SCXRD and PXRD.